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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Balance Sheet Information of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summarized Financial Information of Equity Method Investment [Line Items]
Current assets	$ 438.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	$ 549.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Non-current assets	11,399.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	10,683.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Current liabilities	671.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	720.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Non-current liabilities	$ 2,344.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	$ 2,331.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities

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